Đáp án + Giải thích các bước giải:
a, `2,5 + 19/10 + 4/15 - 1 5/15`
` = 5/2 + 19/10 + 4/15 - 4/3`
` = (5/2 + 19/10) + (4/15 - 4/3)`
` = (25/10 + 19/10) + (4/15 - 20/15)`
` = 22/5 - 16/15`
` = 66/15 - 16/15`
` = 50/15 = 10/3`
b, `5/16 . 24/15 + 2/4 . 4/3 - 7/6`
` = 1/2 + 2/3 - 7/6`
` = 3/6 + 4/6 - 7/6`
` = 0`
c, `25% - 4/12 + 5/9 - 16/18`
` = 1/4 - 1/3 + 5/9 - 8/9`
` = 1/4 - 1/3 - 1/3`
` = 3/12 - 4/12 - 4/12`
` = -5/12`
d, `12/15 - |-4/24| + 8/60 - (-2020/2019)^0`
` = 4/5 - 1/6 + 2/15 - 1`
` = 24/30 - 5/30 + 4/30 - 30/30`
` = -7/30`
